CN112788549A - CBTC multicast transmission method and system - Google Patents
CBTC multicast transmission method and system Download PDFInfo
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- CN112788549A CN112788549A CN202110011910.XA CN202110011910A CN112788549A CN 112788549 A CN112788549 A CN 112788549A CN 202110011910 A CN202110011910 A CN 202110011910A CN 112788549 A CN112788549 A CN 112788549A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
Abstract
The invention provides a CBTC multicast transmission method and a system thereof, comprising: acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal; setting a destination IP address and a destination port for the transmitted car-state data packet; sending a car-state to the multicast IP address; and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address. According to the invention, the special bearer for train state information transmission is established among the parking lot CBTC system server, the core network and the base station, the car-state is transmitted through the special bearer, and the car-state is transmitted to each train UE terminal in a multicast mode, so that the transmission bandwidth is effectively saved.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a CBTC multicast transmission method and a system.
Background
In the existing CBTC communication system, when multiple vehicles are running, the parking lot needs to receive train entering and exiting information and transmit state information and control information to the trains, so as to coordinate the state information of more vehicles entering and exiting the parking lot, the entering state, the movement authorization, the train number, the train position and the running direction, and the control information of train starting, braking, vehicle door and running control. The current processing mode for the CBTC parking lot service is that each train signal is sent independently, namely, a parking lot signal system receives the CBTC train state information when a train enters, and a parking lot ATS (automatic train monitoring system) system transmits train state and control information to the train after receiving and processing the CBTC train state information, so as to coordinate the train entering and entering. When multiple vehicles are parked, the parking lot CBTC server needs to issue the status and control service information of each train, and the traffic volume may be represented as (train status information car-state + train control information car-act) number of vehicles n.
Therefore, a new CBTC bandwidth resource transmission method is needed to solve the problem of large bandwidth occupation.
Disclosure of Invention
The invention provides a CBTC multicast transmission method and a CBTC multicast transmission system, which are used for solving the defect of large bandwidth occupation in the prior art.
In a first aspect, the present invention provides a CBTC multicast transmission method, including:
acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal;
setting a destination IP address and a destination port for the transmitted car-state data packet;
sending a car-state to the multicast IP address;
and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
Further, the acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal further includes:
the base station establishes the special bearer for transmitting the car-state according to the request of the core network;
adding special multicast RNTI (radio network temporary identifier) to a protocol MAC (media access control) of the base station, wherein the special multicast RNTI is used for scrambling and descrambling multicast information by the base station and the train UE terminal.
Further, the setting of the addressed IP address and port for the transmitted car-state packet further includes:
and acquiring train position information from the ATP system, and judging whether the train UE terminal is in the multicast group according to the train position information.
Further, the setting of the addressed IP address and port for the transmitted car-state packet specifically includes:
and binding the IP address of the train UE terminal with the multicast IP address, wherein the train UE terminal is used as a receiving end, namely, the train UE terminal is added into a multicast group and is bound with the train UE port number.
Further, after receiving the car-state, the core network maps the car-state to a pre-established dedicated bearer according to the multicast IP address, which specifically includes:
and acquiring a Packet Filter in the service flow template associated with the car-state, and mapping the Packet Filter to the special bearer through the multicast IP address and the train UE port number.
In a second aspect, the present invention further provides a CBTC multicast transmission method, including:
acquiring a multicast IP address and a train UE port number negotiated with a CBTC (communication based train control) server;
after the CBTC server binds the multicast IP address and the train UE port number, adding the CBTC into a multicast group and binding the train UE port number;
and receiving the car-state sent by the CBTC server through the train UE port number in the multicast group, and taking the car-state as the car-state of the train.
In a third aspect, the present invention further provides a CBTC multicast transmission system, including:
the first acquisition module is used for acquiring a multicast IP address negotiated with a train UE terminal and a train UE port number;
the setting module is used for setting the sent IP address and port for the sent car-state data packet;
a first sending module, configured to send a car-state to the multicast IP address;
and the mapping module is used for mapping the car-state to a pre-established special bearer according to the multicast IP address after the core network receives the car-state.
In a fourth aspect, the present invention further provides a CBTC multicast transmission system, including:
the second acquisition module is used for acquiring a multicast IP address and a train UE port number negotiated with the CBTC server;
the joining module is used for joining a multicast group and binding the train UE port number after the CBTC server binds the multicast IP address and the train UE port number;
and a second sending module, configured to receive, in the multicast group, the car-state sent by the CBTC server through the train UE port number, and use the car-state as a car-state of a train.
In a fifth aspect, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the CBTC multicast transmission method according to any one of the above embodiments.
In a sixth aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the CBTC multicast transmission method according to any one of the above.
According to the CBTC multicast transmission method and the CBTC multicast transmission system, the special bearer for train state information transmission is established among the parking lot CBTC system server, the core network and the base station, car-state is transmitted through the special bearer, and the car-state is transmitted to each train UE terminal in a multicast mode, so that transmission bandwidth is effectively saved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a CBTC multicast transmission method according to the present invention;
fig. 2 is a schematic diagram of a CBTC multicast transmission flow provided by the present invention;
fig. 3 is a second schematic flow chart of the CBTC multicast transmission method according to the present invention;
fig. 4 is a schematic structural diagram of a CBTC multicast transmission system provided in the present invention;
fig. 5 is a second schematic structural diagram of a CBTC multicast transmission system provided in the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the problems in the prior art, and reducing the occupation of the bandwidth by the CBTC in the scene of multiple vehicles entering and exiting the parking lot, the invention provides a CBTC multicast transmission method, as shown in fig. 1, the execution subject of the embodiment is one side of a CBTC server in the parking lot, and the method includes:
101, acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal;
102, setting a destination IP address and a destination port for the transmitted car-state data packet;
103, sending car-state to the multicast IP address;
and 104, after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
Specifically, the invention establishes a dedicated bearer for train status information transmission between the parking lot CBTC system server and the core network and the base station, transmits car-state through the bearer, and then transmits car-state to each train UE terminal in a multicast manner, where the traffic is represented as car-state + car-act n, and the specific flow is shown in fig. 2.
It can be understood that a dedicated communication link is established among the CBTC server, the core network, the base station, and the train UE terminals for transmitting train information, each train UE terminal in the parking lot is used as a multicast group member, and can dynamically join or leave the multicast group while entering or leaving the field section, and the method needs to implement the following steps:
1) the eNB establishes a special bearer for transmitting the car-state according to the request of the core network;
2) adding a G-RNTI (multicast special RNTI) on an eNB protocol MAC layer, wherein the G-RNTI is used for scrambling and descrambling the multicast information by a parking lot base station and train UE;
3) the CBTC server appoints IP-G (multicast IP address) and Port-G (train UE Port number) with the train UE terminal for the transmission of car-state;
4) the CBTC server sets the IP and the Port to which the IP and the Port are sent, namely IP-G and Port-G, for the transmitted car-state data packet, the server binds the local IP of the train UE with the IP-G, the train UE is used as a receiving end, namely, the train UE is added into a multicast group, and meanwhile the train UE is bound with the Port-G;
5) the CBTC judges whether the train UE is in a multicast group according to train position information acquired from an ATP (automatic train protection) system;
6) the CBTC server sends car-state to IP-G;
7) after receiving the car-state sent by the server, the core network maps the car-state to a special bearer according to the IP-G;
8) the train UE receives the car-state on Port-G within the multicast group, i.e., the car-state of the train.
The invention establishes a special communication link among the CBTC server, the core network, the base station and the train UE terminal, is used for bearing each packed train UE car-state during multicast, applies the multicast technology to CBTC service transmission, and reduces the traffic volume of the CBTC server for transmitting the train state information.
Based on the above embodiment, the method further includes, before step S1:
the base station establishes the special bearer for transmitting the car-state according to the request of the core network;
adding special multicast RNTI (radio network temporary identifier) to a protocol MAC (media access control) of the base station, wherein the special multicast RNTI is used for scrambling and descrambling multicast information by the base station and the train UE terminal.
Based on any embodiment, the method further includes, after step S2:
and acquiring train position information from the ATP system, and judging whether the train UE terminal is in the multicast group according to the train position information.
Specifically, compared with the service processing mode of the existing parking lot signal system in this aspect, the CBTC server needs to acquire parking lot boundary area information, the CBTC server judges whether the train UE is in the multicast group according to whether the train position is in the parking lot range, and the service processing of the train information is shown in that car-state is transmitted on the corresponding special bearer, so that the CBTC server only needs to send car-state once, and then sends the car-state to the train in the multicast group through a multicast route, so that the improved traffic is reduced to car-state + car-act n, the number of times that the CBTC server sends the train state information car-state is reduced, and the redundant sending of the car-state is reduced.
The CBTC server judges whether the train UE is in the multicast group according to whether the train position is in the parking lot range or not so as to determine the train information required to be contained by car-state, and the train can actively join or leave the multicast group according to the actual situation.
Based on any of the above embodiments, step S2 in the method specifically includes:
and binding the IP address of the train UE terminal with the multicast IP address, wherein the train UE terminal is used as a receiving end, namely, the train UE terminal is added into a multicast group and is bound with the train UE port number.
Specifically, the CBTC binds the local IP of the train UE with the IP-G, the train UE serves as a receiving end, namely, the train UE joins in a multicast group, and meanwhile, the train UE binds with the Port-G.
A multicast group is established at each train UE terminal, when a train starts or finishes the main line operation to get in and out of a parking lot, corresponding in-out field line information is triggered, the position of the train in-out field line is taken as the boundary area information of the parking lot, a CBTC server of the parking lot determines which train UEs are in the multicast group according to the acquired train position information, the train UEs are taken as group members, the relationship management is group member information of a direct connection network segment established on a multicast route, an ATP system can automatically and continuously detect and dynamically update the position of the train, the train UEs can also actively report the joining or leaving of the multicast group, and the train UEs can dynamically join or leave the multicast group while the train enters or leaves the station. The CBTC server judges whether the train UE is in the multicast group according to the acquired train position so as to determine which trains the car-state needs to contain. The method comprises the steps that a CBTC server sends a car-state through a special communication link to determine group member information as a whole, the server serves as a source host to send the car-state to a multicast group where train UE is located, a core network is mapped to a G-RNTI according to IP-G, a multicast route searches for a forwarding path according to a destination address of the train UE, and the train UE receives the car-state of the train on a corresponding Port-G and descrambles the received information by using the G-RNTI.
Based on any of the above embodiments, after receiving the car-state, the core network maps the car-state to a pre-established dedicated bearer according to the multicast IP address, which specifically includes:
and acquiring a Packet Filter in the service flow template associated with the car-state, and mapping the Packet Filter to the special bearer through the multicast IP address and the train UE port number.
Specifically, for a dedicated bearer, it is necessary to explicitly transmit a mapping relationship of a data stream to the dedicated bearer, which is implemented by a Packet Filter in a TFT (traffic flow template) associated with the dedicated bearer, and mapping the dedicated bearer to transmit a car-state through an IP address and a port number, so that information received by a train UE terminal at a corresponding port number can be regarded as state information of the train.
Based on any of the above embodiments, fig. 3 is a second schematic flow chart of the CBTC multicast transmission method provided by the present invention, where an execution main body of the embodiment is a train UE terminal side, and the method includes:
201, acquiring a multicast IP address and a train UE port number negotiated with a CBTC server;
202, after the CBTC server binds the multicast IP address and the train UE port number, adding to a multicast group and binding the train UE port number;
and 203, receiving the car-state sent by the CBTC server through the train UE port number in the multicast group, and using the car-state as the car-state of the train.
Specifically, a dedicated communication link is established among the CBTC server, the core network, the base station, and the train UE terminals for transmitting train information, and each train UE terminal in the parking lot is used as a multicast group member, and can dynamically join or leave the multicast group while entering and exiting the parking lot, and the method needs to implement the following steps:
1) the eNB establishes a special bearer for transmitting the car-state according to the request of the core network;
2) adding a G-RNTI (multicast special RNTI) on an eNB protocol MAC layer, wherein the G-RNTI is used for scrambling and descrambling the multicast information by a parking lot base station and train UE;
3) the CBTC server appoints IP-G (multicast IP address) and Port-G (train UE Port number) with the train UE terminal for the transmission of car-state;
4) the CBTC server sets the IP and the Port to which the IP and the Port are sent, namely IP-G and Port-G, for the transmitted car-state data packet, the server binds the local IP of the train UE with the IP-G, the train UE is used as a receiving end, namely, the train UE is added into a multicast group, and meanwhile the train UE is bound with the Port-G;
5) the CBTC judges whether the train UE is in a multicast group according to train position information acquired from an ATP (automatic train protection) system;
6) the CBTC server sends car-state to IP-G;
7) after receiving the car-state sent by the server, the core network maps the car-state to a special bearer according to the IP-G;
8) the train UE receives the car-state on Port-G within the multicast group, i.e., the car-state of the train.
The invention establishes a special communication link among the CBTC server, the core network, the base station and the train UE terminal, is used for bearing each packed train UE car-state during multicast, applies the multicast technology to CBTC service transmission, and reduces the traffic volume of the CBTC server for transmitting the train state information.
The structure of the CBTC multicast transmission system provided by the present invention is described below, and the CBTC multicast transmission system described below and the CBTC multicast transmission method described above may be referred to in correspondence with each other.
Fig. 4 is a schematic structural diagram of a CBTC multicast transmission system provided in the present invention, as shown in fig. 4, including: a first obtaining module 41, a setting module 42, a first sending module 43 and a mapping module 44; wherein:
the first obtaining module 41 is configured to obtain a multicast IP address and a train UE port number negotiated with a train UE terminal; the setting module 42 is configured to set a destination IP address and a port for the transmitted car-state packet; a first sending module 43 is configured to send a car-state to the multicast IP address; the mapping module 44 is configured to, after receiving the car-state, the core network map the car-state to a pre-established dedicated bearer according to the multicast IP address.
Fig. 5 is a second schematic structural diagram of a CBTC multicast transmission system provided in the present invention, as shown in fig. 5, including: a second obtaining module 51, a joining module 52 and a second sending module 53; wherein:
the second obtaining module 51 is configured to obtain a multicast IP address and a train UE port number negotiated with the CBTC server; the joining module 52 is configured to join the multicast group and bind the train UE port number after the CBTC server binds the multicast IP address and the train UE port number; the second sending module 53 is configured to receive, within the multicast group, a car-state sent by the CBTC server through the train UE port number, and use the car-state as a car-state of a train.
Fig. 6 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 6: a processor (processor)610, a communication interface (communication interface)620, a memory (memory)630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 are communicated with each other via the communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a CBTC multicast transmission method comprising: acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal; setting a destination IP address and a destination port for the transmitted car-state data packet; sending a car-state to the multicast IP address; and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the CBTC multicast transmission method provided by the above methods, the method comprising: acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal; setting a destination IP address and a destination port for the transmitted car-state data packet; sending a car-state to the multicast IP address; and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform the CBTC multicast transmission method provided in the above aspects, the method including: acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal; setting a destination IP address and a destination port for the transmitted car-state data packet; sending a car-state to the multicast IP address; and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A CBTC multicast transmission method is characterized by comprising the following steps:
acquiring a multicast IP address and a train UE port number negotiated with a train UE terminal;
setting a destination IP address and a destination port for the transmitted car-state data packet;
sending a car-state to the multicast IP address;
and after receiving the car-state, the core network maps the car-state to a pre-established special bearer according to the multicast IP address.
2. The CBTC multicast transmission method according to claim 1, wherein said obtaining a multicast IP address and a train UE port number negotiated with a train UE terminal further includes:
the base station establishes the special bearer for transmitting the car-state according to the request of the core network;
adding special multicast RNTI (radio network temporary identifier) to a protocol MAC (media access control) of the base station, wherein the special multicast RNTI is used for scrambling and descrambling multicast information by the base station and the train UE terminal.
3. The CBTC multicast transmission method according to claim 1, wherein said setting a destination IP address and a port for a transmitted car-state packet further includes:
and acquiring train position information from the ATP system, and judging whether the train UE terminal is in the multicast group according to the train position information.
4. The CBTC multicast transmission method according to claim 1, wherein said setting a destination IP address and a port for the transmitted car-state packet specifically includes:
and binding the IP address of the train UE terminal with the multicast IP address, wherein the train UE terminal is used as a receiving end, namely, the train UE terminal is added into a multicast group and is bound with the train UE port number.
5. The CBTC multicast transmission method according to claim 1, wherein after receiving the car-state, the core network maps the car-state to a pre-established dedicated bearer according to the multicast IP address, specifically comprising:
and acquiring a Packet Filter in the service flow template associated with the car-state, and mapping the Packet Filter to the special bearer through the multicast IP address and the train UE port number.
6. A CBTC multicast transmission method is characterized by comprising the following steps:
acquiring a multicast IP address and a train UE port number negotiated with a CBTC (communication based train control) server;
after the CBTC server binds the multicast IP address and the train UE port number, adding the CBTC into a multicast group and binding the train UE port number;
and receiving the car-state sent by the CBTC server through the train UE port number in the multicast group, and taking the car-state as the car-state of the train.
7. A CBTC multicast transmission system, comprising:
the first acquisition module is used for acquiring a multicast IP address negotiated with a train UE terminal and a train UE port number;
the setting module is used for setting the sent IP address and port for the sent car-state data packet;
a first sending module, configured to send a car-state to the multicast IP address;
and the mapping module is used for mapping the car-state to a pre-established special bearer according to the multicast IP address after the core network receives the car-state.
8. A CBTC multicast transmission system, comprising:
the second acquisition module is used for acquiring a multicast IP address and a train UE port number negotiated with the CBTC server;
the joining module is used for joining a multicast group and binding the train UE port number after the CBTC server binds the multicast IP address and the train UE port number;
and a second sending module, configured to receive, in the multicast group, the car-state sent by the CBTC server through the train UE port number, and use the car-state as a car-state of a train.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of the CBTC multicast transmission method according to any of the claims 1 to 6.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the CBTC multicast transmission method according to any one of claims 1 to 6.
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